| 摘要 |
This invention includes a first balance pH tank, a clarifier tank and a final pH balance tank. The first tank periodically receives a certain volume of the waste stream. This tank is equipped with an automatic system for raising the pH so that all the heavy metals will precipitate as oxides and hydroxides. Next the stream is transferred to the clarifier tank. The clarifier tank has a number of internal vertical baffles. The first baffles have perforations near their lower ends. The stream flows from one chamber to the other over or under the first baffles or through their perforations. Then the stream flows over the last baffle. In the clarifier, the precipitate accumulates at the bottom of the tank and the pH drops. Lastly, the stream is transferred to a final pH balance tank where the pH is adjusted to about 7.
|
